@David-TP Thank you very much for your instruction. I could update firmware manually via Web.

The issue still not resolved yet. I usually use mobile app, and it shows an error.

Let me attach the error picture, but it's not Englsh, it's Japanese.. But hope it helps.

Verify that there is a stable connection between the Deco BE85 units and the XE200. Check if they are properly connected and communicating within the mesh network. If all else fails, you may try performing a factory reset on your Deco BE85 units. This will revert the devices to their default settings. Be cautious as this will erase all configurations, and you'll need to set up the network again.

  @benisfroms Thank you for your suggestion. But it's hard for me to reset and re-configure because I need to re-connect all of my devices to wifi, IP reservation settings and so on. (I switched main BE85 to another one and re-configure yesterday, then just set all setting back..)
I will update firmware manually every time. The other function except firmware update works well.

The connection between the units is good and no problem.

I just check the logs and found that there're many ntp error (filtered by critical)

Wed Sep 27 14:08:51 2023 user.crit : ntp check error!!!; errno(2): No such file or directory

And date/time is not correct even though I set correct timezone.

Current Time: 2023-09-27 3:53:30 PM

Is there any way to set ntp server, or login CLI?

  @Shogo I tried to downgrade BE85 firmware from V2_1.0.13 Build 20230927 to V2_1.0.11 Build 20230830.

After downgrade, it worked fine. I could show the firmware upgrade confirmation via mobile app, and the time is now correct.

I think this is a bug of newest firmware. I will keep using previous version of firmware for a while.

  @David-TP Yes, connection type is v6 plus (ipv4 over ipv6). The service provider is GMO. I don't want to set WAN DNS to 8.8.8.8, so I hope it will be fixed soon.

  @Shogo I just set 8.8.8.8 for testing purpose. It's solved system time issue, but it's not solved update issue. Just for your information. (Set 8.8.8.8 for primary DNS address in DHCP configuration. I couldn't set primary DNS in internet connection type setting because there's no way to set it under v6 Plus.